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Old 02-13-2020, 07:57 AM   #1
opelikamike
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My Ride: 2005 330Ci Vert
Year: 2005
Model: 330Ci Convertible
Transmission: Automatic
A/C Issues on 05 330Ci

I have a 05 330Ci vert with automatic transmission and about 64,000 miles.
Yesterday turned on a/c for first time this season (in Ocala, Florida). No cold air at all out of any vent. Ambient temp was about 80F. Had a/c system checked Sept. 2019.

Reading other posts I first tried to verify electric fan operation (as mine is automatic it has both mechanical and electric fan) by doing the following. I think i have read that A/C compressor clutch cannot engage unless e-fan is running. Is this correct?

1. Turned on engine to see if e-fan ran briefly at startup. Result - no fan rotation on startup.
2. Shut off engine and removed connector from switch on lower radiator hose temp connector as listees indicate that that would force e-fan operation.
3. Restarted car with that connector disconnected. Result - no fan operation.
4. Turned engine off and reinstalled connector.

Given this, is the next step to try to use INPA (I have it on a laptop but haven't used it much) to run E-fan test mode (as BMW North has outlined I believe) in order to see if e-fan itself is functional?

I just want to do things in the right order to make sure I don't make an incorrect diagnosis.

Thanks for any help.

Mike in Ocala
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Old 02-13-2020, 08:06 AM   #2
dmax
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Is your outside air temp sensor working properly in the car? The AC needs that to work. That said, not familiar with automatics, but the fan needs to work for the AC to turn on in my manual with electric fan.
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Old 02-13-2020, 08:09 AM   #3
opelikamike
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My Ride: 2005 330Ci Vert
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Yes. Outside air temp sensor (turn signal push button operated) was reading 79F so I assume that indicates proper function.
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Old 02-13-2020, 03:29 PM   #4
opelikamike
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My Ride: 2005 330Ci Vert
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UPDATE-it may be low freon. Turned on a/c today and e fan runs and somewhat (not real cold) cool air comes out of 2 leftmost dash vents but 2 rightmost passenger vents blowing ambient air. From last time I had it into shop this is symptomatic of low freon I think. The shop couldn't find a leak last time but they are going to look again since freon has likely leaked out and may leave a dye trail. I just hope it isn't an evaporator leak where I have to have the dash pulled out!
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Old 02-13-2020, 03:41 PM   #5
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Is the air dry but warm? If so, it may be a bad heater control valve (it was for me).
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Old 02-13-2020, 04:44 PM   #6
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Originally Posted by opelikamike View Post
UPDATE-it may be low freon. Turned on a/c today and e fan runs and somewhat (not real cold) cool air comes out of 2 leftmost dash vents but 2 rightmost passenger vents blowing ambient air. From last time I had it into shop this is symptomatic of low freon I think. The shop couldn't find a leak last time but they are going to look again since freon has likely leaked out and may leave a dye trail. I just hope it isn't an evaporator leak where I have to have the dash pulled out!

Check for an usual odor coming from the vents. Most dyes have an odor that can aid in detection since you can’t see inside the evaporator case. Just had mine checked, and the dash will be coming out soon.
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Old 02-13-2020, 06:59 PM   #7
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Yep, it should be low on refrigerant.
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Old 02-15-2020, 06:39 AM   #8
opelikamike
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My Ride: 2005 330Ci Vert
Year: 2005
Model: 330Ci Convertible
Transmission: Automatic
Took it to shop again. They checked for leaks and could not find any. I have detected to odors coming from vents. They added freon and told me to drive it for 2 weeks and bring it back in for another check. I don't know if this indicates an evaporator leak. Guess we will see in 2 weeks. Freon has to be going somewhere,
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